55980920 has 32 divisors (see below), whose sum is σ = 128027520. Its totient is φ = 22024320.

The previous prime is 55980917. The next prime is 55980923. The reversal of 55980920 is 2908955.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55980917) and next prime (55980923).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55980923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9032 + ... + 13911.

It is an arithmetic number, because the mean of its divisors is an integer number (4000860).

Almost surely, 2^55980920 is an apocalyptic number.

It is an amenable number.

55980920 is an abundant number, since it is smaller than the sum of its proper divisors (72046600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55980920 is a wasteful number, since it uses less digits than its factorization.

55980920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23015 (or 23011 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 55980920 is about 7482.0398288167. The cubic root of 55980920 is about 382.5427807533.

The spelling of 55980920 in words is "fifty-five million, nine hundred eighty thousand, nine hundred twenty".